class Solution7 {
    public static int takeAttendance(int[] records) {
        int left = 0,right = records.length-1;
        while(left < right) {
            int mid = left + (right - left) / 2;
            if(records[mid] == mid) left = mid + 1;
            else {
                right = mid;
            }
        }
        if(records[left] == left) return left + 1;
        return left;
    }

    public static void main(String[] args) {
        int[] array = {0,1,2,3,5};
        int number = takeAttendance(array);
        System.out.println(number);
    }
}